I followed the recipe making half recipe with some changes:
For the brownie batter:
* I used 180g sugar (reduced from 224g for half recipe)
* I omitted chocolate chips
For the cheese batter:
* I used 60g caster sugar (reduced from 75g for half recipe)
* I used 1 tbsp plain flour (reduced from 29g for half recipe)
* I used whipping cream instead of heavy cream

For full recipe, it's required to use 9" x 13" pan
I did half recipe and used a rectangle pan which was a little too small. Hence the tall brownies. Luckily it didn't overflow during baking :)